Comment # 1 on bug 1105305 from Jon Brightwell

Or tumbleweed

> pencil 
Error: Platform version '67.0' is not compatible with
minVersion >= 4.0
maxVersion <= 52.0

They switched to electron for v3. Not sure if it's package-able
https://github.com/evolus/pencil/releases

It might be that this package just needs removing as firefox <52 was a long
time ago.